Dalton's Law of Partial Pressures : Law is valid for non-reacting gases, at constant volume & constant Temperature
pTotal = p1 + p2 + p3 + ---- (at constant T, V) where, pTotal = Total pressure exerted by the mixture of gases p1, p2, = partial pressures of gases, 1, 2 res.
Gases are generally collected over water and therefore are moist. pdry gas = pTotal – Aqueous Tension
Aqueous Tension : Pressure exerted by saturated water vapour.
pTotal : pressure of the moist gas.
Partial Pressure in terms of mole fraction
pi = xi ptotal
where, pi = Partial pressure of the ith gas
xi = mole traction of the ith gas.
